's palace. we'll have a live report from cairo. but, first, u.s. military plans about possible action against syria are changing. senior pentagon officials tell cnn the syrian government could be escalating the civil war. there are new concerns the assad regime is preparing to use chemical weapons. let's get to our pentagon correspondent barbara starr. barbara, how does this change the u.s. military's syria plan? are we talking u.s. troops, boots on the ground? >> well, not at this point, clearly, deb. but what we do know is that u.s. officials tell us that they are updating some of the military options for action against syria's chemical weapons capability, why are they doing this? of course, we chatted about this in the last several days. officials say they do have the intelligence now that syria has filled aerial bombs with deadly sarin gas. haven't moved it to airplanes yet, but this is very concerning because that, of course, would be the next step. so once you have the deadly bombs, the u.s. has to look at what the options could be, what they might want to target to essentially
